A ducted installation in the attic in Le Sud-Ouest, designed to offer invisible and well-distributed comfort
In the borough of Le Sud-Ouest, AirGreen carried out a specialized HVAC installation of a GREE All Match Slim Duct R32 ducted heat pump, integrated into an attic to offer stable comfort without a visible wall unit in the living spaces. This type of system, also called Ducted – Ducted Ducts – Slim Duct – Ductable, is aimed at owners looking for a more discreet solution than a wall air conditioner, while maintaining effective air distribution in several zones of the house.
The construction photo shows an important technical step: the ducted indoor unit is positioned in the roof space, surrounded by wooden framing, existing insulation, and restricted passages. You can also see the black pipe drainage network, communication and control lines, as well as the metal structure of the device. This image sums up the reality of a ducted installation: the visible part once the work is finished is minimal, but the quality of comfort relies on great precision in the hidden areas of the building.
In Le Sud-Ouest, houses and plexes often have particular constraints: limited ceilings, narrow access, renovated buildings, old structures, irregular attics, existing insulation, and sometimes complex technical routes. For this project, our team had to integrate the heat pump into a technical space without compromising future access to HVAC maintenance, while ensuring good condensate drainage, reliable air circulation, and a clean installation.
Why a GREE ducted heat pump in Le Sud-Ouest
A GREE ducted heat pump represents a very interesting solution when the customer wants to air condition and heat several rooms without installing visible wall units. Instead of having a wall head in the living room, bedroom, or hallway, the indoor unit is hidden in the attic, a ceiling, a false ceiling, or a mechanical space. The treated air is then distributed through ducts to discreet grilles.
In this project in Le Sud-Ouest, the goal was to achieve a clean integration into the existing structure. The client wanted to enjoy more uniform comfort without changing the interior appearance of the house with multiple visible units. The GREE ducted system precisely meets this type of need, provided the network is properly sized and the installation respects the building’s realities.
The GREE ducted range offered by AirGreen includes several options depending on needs: low static pressure models, high static pressure models, and All Match Slim Duct R32, with capacities available by series, including 9,000 BTU, 12,000 BTU, 18,000 BTU, 21,000 BTU, 24,000 BTU, 30,000 BTU, and 36,000 BTU. This variety allows us to recommend a solution adapted to the area, insulation, number of rooms, duct length, and required static pressure.
An indoor unit installed in a tight technical space
The attic visible in the photo requires a very precise working method. Our technicians must work around the rafters, beams, insulation, existing openings, and limited clearances. A ducted unit cannot simply be placed in the attic: it must be positioned to meet several essential conditions.
Access for service and maintenance
Even if the system is hidden, it must remain accessible. The GREE indoor unit must be able to be inspected, cleaned, and maintained. The filter, condensate pan, fittings, electrical connections, service panels, and drainage must remain reachable. An installation that is too tight or poorly oriented can complicate future interventions and increase maintenance costs.
In this installation in Le Sud-Ouest, the location was chosen to allow discreet integration while maintaining realistic technical access. This is an aspect clients do not always see at the time of the quote but becomes essential throughout the equipment’s lifespan.
Managing existing insulation
Loose-fill insulation and visible insulation batts around the unit require great care. It is important to prevent the insulation from blocking air intakes, interfering with drainage, covering components that need inspection, or obstructing access to panels. Our technicians clear the necessary areas and ensure the installation remains clean and functional.
In a Montreal attic, insulation also plays an important role in performance. Ducts and plenums must be properly insulated when air passes through an unconditioned space. Without this protection, some energy can be lost even before the air reaches the diffusion grilles.
Stable positioning of the unit
A ducted unit must be installed stably, with an orientation compatible with drainage and connections. Even the slightest misleveling can affect the flow of condensate water. In an inclined or irregular space like an attic, this step requires more precision than an installation in an open mechanical room.
Condensate drainage: a critical detail in a Slim Duct installation
The photo clearly shows a black piping network connected to the unit. This drainage system is a fundamental element of a ducted HVAC installation. In cooling mode, the indoor unit removes moisture from the air, which generates condensate water. This water must be properly, continuously, and safely drained.
Poorly designed drainage can cause several problems: water backflow, overflow, odors, safety shutdown, ceiling damage, or moisture in the attic. That is why AirGreen pays special attention to slope, fittings, accessibility, and drain protection.
In this installation in Le Sud-Ouest, the drainage network was carefully assembled to fit into the available space. The elbows, fittings, and layout must allow reliable flow while avoiding unnecessary low points. When the configuration requires it, a condensate pump may be recommended; when gravity is sufficient, the path must still be rigorously validated.
Static pressure: the technical core of a ducted system
A Slim Duct system does not distribute air in the same way as a wall unit. The air must pass through ducts, plenums, elbows, grilles, and sometimes multiple zones. All these elements create resistance called static pressure.
The choice between a low-pressure or high-pressure configuration depends on the length of the network, the number of outlets, the diameter of the ducts, the layout of the rooms, and the desired noise level. A well-chosen machine, but connected to a poorly calculated network, can yield disappointing results. Conversely, a properly sized system can offer very stable comfort with minimal visual presence.
At AirGreen, we analyze:
- the required thermal capacity in BTU;
- the number of rooms to serve;
- the total length of the ducts;
- the diameter of the ducts;
- the number of bends and transitions;
- the location of the air return;
- acceptable noise levels in the rooms;
- insulation around the network;
- future access for HVAC maintenance.
This rigor is especially important in projects in Montreal, where buildings are not always originally designed to accommodate a modern ducted system.
The role of the air return in daily comfort
The air return is as important as the supply. It allows the unit to take back the air from the house to treat it again. If the return is poorly positioned, too small, or blocked, the system can become noisier, lose efficiency, or create temperature differences between rooms.
In a ducted installation in Le Sud-Ouest, the air return must be planned according to the actual layout of the home. Closed doors, narrow corridors, interior divisions, and past renovations can influence circulation. Our approach is to avoid improvised air returns and to ensure coherent circulation between the served zones.
The advantages of the GREE All Match Slim Duct R32
The GREE All Match Slim Duct R32 is part of a range of modern ducted solutions designed for discreet installations. Its compact format facilitates integration into ceilings, attics, or technical spaces, while the refrigerant R32 corresponds to the new generations of residential HVAC equipment.
Depending on the selected models, GREE ducted systems can offer:
- discreet integration into the building structure;
- varied capacities for different residential needs;
- options adapted for short or more complex networks;
- heating performance suitable for Quebec winters depending on the series;
- compatibility with projects where interior aesthetics are a priority;
- a solution adapted for houses, condos, plexes, and renovations.
Certain selected GREE models may also benefit from a warranty of up to 12 years, depending on applicable conditions, installation, and product registration. AirGreen supports its customers in understanding warranties and the necessary documents.
AirGreen expertise for ducted projects in Montréal, Laval, Longueuil, North Shore, and South Shore
Ducted installations require a combination of skills: refrigeration, ventilation, sheet metal work, drainage, control electricity, insulation, and building understanding. That is why this type of project requires a team accustomed to real field conditions.
In the Southwest, our work was not limited to installing an indoor unit. We had to integrate the device into a technical space, manage drainage, respect the existing structure, consider insulation, and prepare a network capable of distributing air efficiently. Every detail contributes to the final result.
A district with particular constraints
The Southwest includes a variety of residential areas: townhouses, plexes, renovated buildings, converted old structures, homes with open ceilings, or technical zones that are hard to access. In this context, a ducted solution must be adapted to the building, not the other way around.
Our installations in Montréal, Laval, Longueuil, on the North Shore and the South Shore have taught us that a good HVAC system relies on the ability to adjust the solution to real constraints. An older house may require a different routing strategy. A low ceiling may require a more compact unit. A cluttered attic may need additional preparation. A duct network that is too long may lead to choosing a different static pressure.
Mistakes to avoid with a ducted heat pump
Before installing a ductable system, several mistakes must be avoided.
Choosing based only on BTU
BTU capacity is important, but it is not enough. You also need to validate static pressure, air distribution, pressure losses, and the number of grilles.
Neglecting drainage
The condensate drain must be reliable, accessible, and properly installed. A ducted system hidden in an attic should never be vulnerable to preventable overflow.
Install the unit without service access
An invisible installation must not become inaccessible. Future maintenance must be planned from the start.
Underestimating duct insulation
In an attic, ducts must be protected against thermal losses. Good insulation helps maintain system performance.
Multiplying outlets without balancing
More grilles do not automatically mean more comfort. Each outlet must receive a flow rate adapted to the room.
Subsidies and eligibility by model
Some GREE heat pumps may be eligible for subsidy programs depending on current criteria, the exact model, certification, capacity, and installed configuration. At AirGreen, we provide the necessary information to the client when the installed equipment meets the applicable requirements.
For owners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this step can be important in calculating the final budget. A detailed invoice, the correct model numbers, proof of payment, and technical information must be kept. We know that documentation is an integral part of a well-executed HVAC project.
The expected result: uniform comfort and almost invisible equipment
Once the installation is complete, the client enjoys a system that is much more discreet than a traditional wall solution. The indoor unit remains hidden in the attic, the ducts supply the designated areas, and the grilles blend into the interior architecture. Comfort is felt, but the equipment does not dominate the space.
This installation of a GREE All Match Slim Duct R32 ducted heat pump in Le Sud-Ouest demonstrates the importance of the work done in areas that are no longer visible after the work. Drainage, service access, unit positioning, insulation, static pressure, and air distribution are the elements that determine the system's quality on a daily basis.
At AirGreen, we prioritize a comprehensive approach: building assessment, model recommendation, careful installation, rigorous commissioning, and support after the work. For clients seeking a discreet, efficient HVAC solution tailored to the realities of Montreal buildings, the GREE ducted system is a very serious option.